What is the main function of a TPM hardware chip?

The main function of a TPM (Trusted Platform Module) hardware chip is to generate and store cryptographic keys. This functionality is critical for enhancing the security of devices, as TPMs provide a secure environment for key management. The chip is designed to generate unique cryptographic keys that can be tied to the hardware it resides in, ensuring that these keys cannot be easily extracted or misused by malicious entities.

By storing these keys securely within the TPM, the hardware chip protects them from being accessed or altered by unauthorized software or users. This key management capability is a foundational element in establishing a trusted computing environment, as these keys can be used for various security functions such as device integrity verification, secure boot processes, and digital rights management.

While methods like controlling access to removable media, performing bulk encryption in hardware, and providing authentication credentials are important security functions, they are not the primary role of a TPM. Instead, these activities may involve utilizing the cryptographic keys generated and stored by the TPM, making the chip's ability to manage these keys the core aspect of its functionality.